And here's what made it to the top of our "instant index" this friday, which is all about song. Starting with this number, 30. It was 30 years ago that michael jackson and quincy jones ended the reign of disco with a little album called "thriller." ♪ Thriller ♪ ♪ thriller night ♪ that jacket michael jackson wore sold for $1.8 million last year. Another jacket from the music video "bad" is expected to bring in $120,000 at an auction in a few days. And his famous glove, at least one of them, expected to go for a cool $50,000. And, a picture in the news. A new song out in the sea. And this is a mechanical hum. From a so-called bio-swimmer, an underwater drone dispatched by homeland security to patrol america's coasts and send back intelligence. It will blend in with the ocean life and watch, it bends and darpt darts, navigates the ocean like a real thing because it's patterned on a tuna. It joins over camouflaged drones, like this robotic humming bird and this cyborg beetle. And a different kind of song. A video duet that made us smile this friday. Who hasn't been enchanted by baby talk? 10-month-old lexi started singing and the family dog just had to join in. Listen. their improvised harmony has been viewed over 6 million times an counting. Unlikely harmony to be sure. And we do want to hear what captures your imagination, every single day. People, pictures. So, tweet me your thoughts for the "instant index index" @dianesawyer. And, coming up, a woman who

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